I just loaded up some 115gr XTP's using a RCBS 10mm seating die with a 9mm plug. Most seated straight, but a few seated crooked and bulged out the neck of the case. They bulged the neck bad enough to where the rounds won't drop in all the way into the chamber of my Barrel. Also the RCBS seater plug left a ring around the nose of the XTP's, the Dillon seater die did not.